Iron and nitrogen-co-doped carbon quantum dots for the sensitive and selective detection of hematin and ferric ions and cell imaging

Wu, Yuqing; Cao, Lei; Zan, Minghui; Zheng, Hangping; Ge, Ming‐Feng; Dong, Wen‐Fei; Li, Li

doi:10.1039/d1an00828e

Cited by 28 publications

(24 citation statements)

References 46 publications

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“…The quantum yield (QY) of PMS‐CQDs (in water) was measured with quinine sulfate (QY S = 54%) dissolved in 0.1 M sulfuric acid (H 2 SO 4 ) as a standard. The QY of PMS‐CQDs was calculated by the following equation [ 13,25 ] :

QY goodbreak= ((), normalQ Y_{S}) ((), I / I_{S}) ((), A_{S} / A) {(η / η_{normalS})}^{2}

where I corresponds to the integrated fluorescence intensity, η corresponds to the refractive index of the solvent, and A corresponds to the absorption density, the subscript ‘S’ refers to the quinine sulfate. The absorbance of PMS‐CQDs and quinine sulfate were kept below 0.05 to minimize the self‐absorption effect.…”

Section: Methodsmentioning

confidence: 99%

“…[32] The three similar peaks at $398.0, $399.9, and $401.8 eV in N1s spectrum of PMS-CQDs and PMS (Figure 2c and S1f) represent the pyridinic-N/pyrrolic-N, graphitic N, and amino N bonds, respectively. [13] The high resolution XPS spectra of S and N showed that S and N were successfully doped into PMS-CQDs, and the defective N structure was maintained in the raw material. [33] F As shown in Figure 2d, the broad peak at 2θ = 24 corresponds to the (002) plane of graphite, [34,35] indicating that the synthesized PMS-CQDs have weak crystallization and smaller size, which is wellmatching with the HRTEM result.…”

Section: Characterization Of Pms-cqdsmentioning

confidence: 95%

“…The quantum yield (QY) of PMS-CQDs (in water) was measured with quinine sulfate (QY S = 54%) dissolved in 0.1 M sulfuric acid (H 2 SO 4 ) as a standard. The QY of PMS-CQDs was calculated by the following equation [13,25] :…”

Section: Measurement Of Fluorescence Quantum Yieldmentioning

confidence: 99%

“…As shown in Figure 4b, the I 550 /I 425 is linearly proportional to the COP concentration in the range of 0.1 to 50 μM with a good linear correlation (R 2 = 0.9974). In addition, LOD was calculated to be about 0.028 μM based on the equation [13] :…”

Section: Sensing Of Copmentioning

confidence: 99%

“…[ 12 ] Especially, due to its distinguished fluorescence characteristics, CQD is widely used as a fluorescent probe to detect metal ions, pollutants and biomolecules. [ 13–15 ] Carbon source or precursor of CQDs is one of the determinant factors for the final physicochemical and functional properties of CQDs. [ 16 ] CQDs have been reported to be obtained from a wide range of materials, including organic molecules and biomass materials.…”

Section: Introductionmentioning

confidence: 99%

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Paper mill sludge‐based carbon quantum dots as a specifically ratiometric fluorescent probe for the sensitive and selective detection of coptisine

Chen

Huang

et al. 2022

Luminescence

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Coptisine (COP), one of the bioactive components in Rhizoma Coptidis, has many pharmacological effects. Meanwhile, the determination of COP is essential in pharmacological and clinical applications. Herein, we prepared carbon quantum dots (CQDs) by one-step oil-thermal method using paper mill sludge (PMS) as precursor, and developed a ratiometric fluorescence method for the determination of COP. The structural and optical properties of PMS-CQDs were evaluated through highresolution transmission electron microscopy (HRTEM), Fourier-transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), ultraviolet-visible (UV-vis), fluorescence, zeta potential and fluorescence lifetime experiments. Fluorescence intensity ratio at 550 nm and 425 nm (I 550 /I 425 ) was recorded as an index for quantitative detection of COP. The detection concentration of COP ranges from 0.1 to 50 μM in good linear correlation (R 2 = 0.9974) with a limit of detection of 0.028 μM (3σ/k). The quenching mechanism was deduced to be inner filter effect and static quenching. The ratiometric fluorescent probe showed impressive selectivity and sensitivity towards COP, and was successfully applied to the detection of COP in human urine with expected recoveries (95.22-111.00%) and relative standard deviations (0.46-2.95%), indicating that our developed method has a great application prospect in actual sample detection.

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QY goodbreak= ((), normalQ Y_{S}) ((), I / I_{S}) ((), A_{S} / A) {(η / η_{normalS})}^{2}

Section: Methodsmentioning

confidence: 99%

Section: Characterization Of Pms-cqdsmentioning

confidence: 95%

Section: Measurement Of Fluorescence Quantum Yieldmentioning

confidence: 99%

Section: Sensing Of Copmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Paper mill sludge‐based carbon quantum dots as a specifically ratiometric fluorescent probe for the sensitive and selective detection of coptisine

Chen

Huang

et al. 2022

Luminescence

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Altering Chain Flexibility of Aliphatic Polyesters for Yellow‐Green Clusteroluminescence in 38 % Quantum Yield

Chu

Zhang

et al. 2021

Angewandte Chemie

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Preparation of non-conjugated polymers with longwavelength emission and high quantum yield (QY) is still ahuge challenge.Herein, we report the first example of linear non-conjugated polyester exhibiting yellow-green clusteroluminescence (CL) and ah igh QY of 38 %. We discovered that the polyester P3 with balanced flexibility and rigidity showed the longest CL wavelength and highest QY.S ystematically photophysical characterization unravel the key role of ester cluster in the CL and the cluster formation via the aggregate of ester units was visualized. Moreover,P 3w as demonstrated to be ah ighly selective,q uick-responsive (ca. 1.2 min) and sensitive detector (detection limit is 0.78 mM) for irons owing to the fast disassociation of clusters by irons.T his work not only gains further mechanistic insight into CL but also provides an ew strategy to design high-efficiency and longwavelength CL, meanwhile,enlightens the glorious application prospect of luminescent polyester.

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Altering Chain Flexibility of Aliphatic Polyesters for Yellow‐Green Clusteroluminescence in 38 % Quantum Yield

et al. 2021

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Iron and nitrogen-co-doped carbon quantum dots for the sensitive and selective detection of hematin and ferric ions and cell imaging

Abstract: Schematic diagram for the detection of ferric ions and hematin by Fe,N-CDs.

Cited by 28 publications

References 46 publications

Paper mill sludge‐based carbon quantum dots as a specifically ratiometric fluorescent probe for the sensitive and selective detection of coptisine

Paper mill sludge‐based carbon quantum dots as a specifically ratiometric fluorescent probe for the sensitive and selective detection of coptisine

Altering Chain Flexibility of Aliphatic Polyesters for Yellow‐Green Clusteroluminescence in 38 % Quantum Yield

Altering Chain Flexibility of Aliphatic Polyesters for Yellow‐Green Clusteroluminescence in 38 % Quantum Yield

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